An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre h

An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre has magnitude
A. `(mu_(0)"ne")/(2pir)`
B. zero
C. `(mu_(0)n^(2)e)/(r)`
D. `(mu_(0)"ne")/(2r)`

An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre has magnitude

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